Source Amazon Ads: dynamic date, customizable report type and metrics

## Tell us about the problem you're trying to solve
As of right now, the Amazon Ads connector generates all of the available reports everytime it syncs right out of the box. In this case, if you want to extract a large range and if you have a lot of data, it can take quite a lot of time to complete the sync.

## Describe the solution you’d like
I'd like to suggest the following changes in the connector settings:
- **Allow metric selection**: This one is kinda hard because different reports have different metrics and I understand if that's not possible
- **Allow report type selection** (adGroup, Campaign and Keyword): This one is the key difference here, if this could be customizable it would help a ton.
- **Dynamic start date**: for example "Last 15 days", "Last 30 days". As of right now, it only syncs yesterday OR a fixed start date that the user sets.

## Describe the alternative you’ve considered or used
For the Dynamic Date, I'll try to use Airbyte's API to dynamically change the connector settings, although it'd be much easier if it had this option out of the box.

## Additional context
Hope this request if within the guidelines :D If not, I'll happily edit it. Thanks for the attention :)